Borrowing it
Nothing to install: this file belongs to poteto/noodle. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/poteto/noodle/main/.agents/skills/ts-best-practices/SKILL.mdgit clone --depth 1 https://github.com/poteto/noodleWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/poteto/noodle/ts-best-practices)<a href="https://agentmods.dev/skills/poteto/noodle/ts-best-practices"><img src="https://agentmods.dev/badge/skills/poteto/noodle/ts-best-practices.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00110 | $0.00413 |
| Opus 5 | $0.00055 | $0.00206 |
| Sonnet 5 | $0.00022 | $0.00083 |
| Haiku 4.5 | $0.00011 | $0.00041 |
Grade A, and why
ts-best-practices scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Type Safety
This project's TypeScript policy. Apply when writing or reviewing TypeScript.
| Rule | Summary |
|---|---|
No as casts |
Every as is a potential runtime crash. Validate at boundaries, then cast only if earned. Prefer Zod/Valibot over manual validation. |
unknown over any |
any disables type checking for everything it touches. External data is always unknown. |
| Discriminated unions | Model variants with a shared literal discriminant. No optional-field bags. |
| Narrowing hierarchy | Prefer: discriminated union switch > in operator > typeof/instanceof > type guard > as |
| Type guards | Must actually verify the claim. Name them isX or hasX. Prefer discriminant narrowing when possible. |
| Exhaustiveness checks | Always add default: never arm to switches over discriminated unions. Use an absurd() helper to reduce boilerplate. |
satisfies over as |
When verifying a value matches a type without widening, use satisfies to preserve literal types. |
| Impossible states | If a bug requires asking "can this combination happen?" the type is too loose. Tighten it. |
Read references/patterns.md for code examples of each rule.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 28 lines · 110 tokens per session scan A db7236ec0540
ts-best-practices is a skill published in the GitHub repository poteto/noodle (269 stars, last pushed 5mo ago), licensed MIT. It adds 110 tokens to every session and 413 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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